Associated Press

Tony Stewart is shown Daytona International Speedway in Daytona Beach, Fla., in this July 6 AP file photo.

Tony Stewart was back driving a sprint car on Friday night, the same series in which he was racing when he broke two bones in his right leg.

It was unknown if it was Stewart's first sprint car race this season because he didn't announce when he'd compete. He is available to race because the NASCAR Sprint Cup Series is off this weekend.

Stewart's runs were posted on Facebook and Twitter. Dirt track star Dustin Daggett tweeted a photo of Stewart's No. 14 car at Tri-City Motor Speedway in Auburn, Mich. Daggett also tweeted, "Raced hard in heat against Tony Stewart! But we got him, now for the Feature!"

Stewart crashed last year at Southern Iowa Speedway in Oskaloosa, where he flipped his 360 winged sprint car while leading with five laps remaining in the 30-lap feature. He missed the final 15 Cup races last year after breaking his leg in two places.

Stewart posted several pictures to his new Twitter account in May of a car he drove for a test session. He also posted that the car had safety improvements to the torque tube to prevent an injury such as the one he suffered.